Engineer: Marine engineer, mechanic, marine engine Supervises and coordinates activities of crew engaged in operating and maintaining propulsion engines and other engines, boilers, deck machinery, and electrical, refrigeration, and sanitary equipment aboard ship: Inspects engines and other equipment and orders crew to repair or replace defective parts. Starts engines to propel ship and regulates engines and power transmission to control speed of ship. Stands engine-room watch during specified periods, observing that required water levels are maintained in boilers, condensers, and evaporators, load on generators is within acceptable limits, and oil and grease cups are kept full. Repairs machinery, using handtools and power tools. Maintains engineering log and bell book (orders for changes in speed and direction of ship). May also be required to hold appropriate U.S. Coast Guard license, depending upon tonnage of ship, type of engines, and means of transmitting power to propeller shaft. When more than one ENGINEER (water industry) is required, may also be designated Engineer, Chief (water industry), Engineer, First Assistant (water industry), Engineer, Second Assistant (water industry), Engineer, Third Assistant (water industry). May also be designated according to ship assigned as Barge Engineer (water industry), Cannery-Tender Engineer (water industry), Engineer, Fishing Vessel (water industry), Tugboat Engineer (water industry). May also be designated Cadet Engineer (water industry) when in training.